Compression refrigerating machine



Aug. 18; 1936. A. TLK. 2,051,756-

-co1\a1=REssIoN REFRIGERATING MACHINE Filed Dep. A28, 1934, 2sheets-sheet 1 Aug. 18, 1936. A, TLK 2,051,756

COMPRESSION REFRIGERATING MACHINE Filed Dec. 28, 1954 ,2 Sheets-Sheet?Patenfed Aug. 18,V 1936 v l UNITED STATES PATENT oFFlCE vextreme upperportion of the cylinder there are provided holes 61,. The pipe 66 leadsfrom the evaporator to the suction side of the compressor.

and issues at 68.

In the form of construction shown in Fig. 2 the evaporator consists of acasing 69 in which there is disposed a container 'i0 which is made intocommunicating compartments A and yB by the provision of a partition wall1I. The compartment A of the container is provided with a cover I2through which the pipe 6' coming from the reduction valve debouches.Into the compartment B, which is open at -the top, there extends a tube66' which is connected to the suction side of the compressor. In theoutside wall of the compartment A there is provided an over. ow 13. Thelower end of the tube 66 is at a lower level than this overflow.

The cooling medium vapor passing during the operationof the machinethrough the non-return valve 2 and pipe line 3 into the condenser 4 isvcooled in a known manner, and consequently condensed. The condensatethen passes through the pipe 3' into the regulating valve 5. On theattainment of a certain level in the casing of the valve 5, the iioatmember 56 is lifted and the cooling medium passes through the valve 6Iand pipe i into the cylinder 64 of-the evaporator 1. VThe lubricantcarried along with the cooling medium falls to the bottom and rises inthe tube 65 under the weight of the cooling medium superposed thereonuntil it Areaches the orifice of the tube 86 and can be drawn off by thecompressor. In addition the cooling medium vapor is constantly suckedback into the compressor through the tube 60.

In the form of construction shown in Fig. 2the liquefied cooling mediumpasses through the pipe 6' into. the compartment A of the container 10in which the lubricant descends, passes over into the compartment B, andthere rises until it reaches the lower end of the pipe 66', so that thelubricant can be drawn oif to the compressor through this pipe.

Both forms of construction provide perfect separationy of the coolingliquid from the lubricant, and permit with certainty of returning thelubricant to the compressor.

In consequence of the independence of the returning of the lubricant,irrespective of the level of the liquid in the evaporator, the degree offilling of the machine with cooling agent can vary within fairly widelimits. Losses through escaping of cooling agent likewise are of noconsequence. The arrangement of the communicating vessel within theevaporator has the particular advantage that the cooling medium in t ecommunicating vessel is protected against the intrusion of heat throughthe evaporator or through the cooling liquid contained therein, so thatthe separation of the two media can take place unimpeded.

I claim:

1. A lubricating separator for compression refrigerating machinescomprising an evaporator and a communicatingvessel. said communicatingvessel having two hollow iiuid receiving legs, one of said legs beingadapted to receive a column of lubricant and a superimposed column ofcooling iluid, the other of said legs being adapted to receive a columnoflubricant alone, a suction pipe connected to said second named leg,and said first named leg being provided with an overilow for feeding thesurplus cooling iiuid to the evaporator.

2. A lubricant separator according ,to claim l, characterized by thefact that the communicating vessel is disposed within the evaporator.

ANTON "rLK, l

